Cover plate assembly, battery cell, battery pack and vehicle

Abstract

The utility model discloses a cover plate assembly, a battery monomer, a battery pack and a vehicle. The cover plate assembly comprises a cover plate, at least one first weight reduction groove is formed in the bottom of the cover plate, and the depth of the first weight reduction groove is smaller than the thickness of the cover plate. Compared with the prior art, the weight reduction groove is formed in the cover plate, so that the weight of the cover plate assembly is reduced, the use amount of manufacturing raw materials is reduced, the cost of the battery can be saved, the energy density of the battery is improved, and the purposes of reducing cost and improving efficiency are achieved.

Description

Technical Field

[0001] The utility model generally relates to the technical field of batteries, and more specifically to a cover plate assembly, a battery cell, a battery pack and a vehicle. Background Art

[0002] Lithium-ion batteries are currently the most common power batteries. The current lithium-ion aluminum shell battery consists of an aluminum shell, an insulating film, a cover assembly (top spacer, cover, terminal assembly), a pole core, and various protective tapes. The cover assembly has a complex structure, many parts, and a high cost. It also occupies a certain weight of the battery, which in disguise reduces the energy density of the battery.

[0003] Therefore, it is necessary to provide a cap plate assembly, a battery cell, a battery pack and a vehicle to at least partially solve the above problems. Utility Model Content

[0004] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the detailed implementation section. The utility model content section of the utility model does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0005] In order to solve the problems of complex structure and low sealing reliability of the above-mentioned terminal assembly, the first aspect of the utility model provides a cover plate assembly, comprising:

[0006] A cover plate, wherein at least one first weight-reducing groove is arranged at the bottom of the cover plate, and the depth of the first weight-reducing groove is less than the thickness of the cover plate.

[0007] Optionally, the cover plate is provided with a boss and / or a pole assembly hole, and the first weight-reducing groove is provided to avoid the boss and the pole assembly hole.

[0008] Optionally, the cover plate is further provided with an explosion-proof valve exhaust hole or a liquid injection hole, and the first weight reduction groove is arranged to avoid the explosion-proof valve exhaust hole or the liquid injection hole.

[0009] Optionally, the cover plate assembly further includes:

[0010] A lead-out piece, wherein at least one second weight-reducing groove is arranged on the top of the lead-out piece, and the depth of the second weight-reducing groove is less than the thickness of the lead-out piece.

[0011] Optionally, the lead-out piece is provided with a lead-out hole, the lead-out hole is used to connect the terminal assembly, and the second weight-reducing groove is arranged to avoid the lead-out hole.

[0012] Optionally, first reinforcing ribs are provided between the second weight-reducing grooves.

[0013] Optionally, the cover plate assembly further includes:

[0014] A top spacer ring, wherein at least one third weight-reducing groove is arranged at the bottom of the top spacer ring, and the depth of the third weight-reducing groove is less than the thickness of the top spacer ring.

[0015] Optionally, the top spacer is provided with a through hole and a mounting groove, and the third weight-reducing groove is arranged to avoid the through hole and the mounting groove.

[0016] Optionally, a second reinforcing rib is provided between the third weight-reducing grooves;

[0017] The installation groove is used for installing the lead-out piece, and a third reinforcing rib is arranged in the installation groove.

[0018] A second aspect of the present invention provides a battery cell, comprising:

[0019] A housing, wherein the top of the housing is provided with an opening;

[0020] According to the cover plate assembly described in any one of the above technical solutions, the cover plate assembly is arranged at the opening of the outer shell, and the cover plate assembly is sealed and connected to the outer shell.

[0021] A third aspect of the present invention provides a battery pack, comprising a battery cell according to any one of the above technical solutions.

[0022] A fourth aspect of the utility model provides a vehicle, comprising a power mechanism and a battery pack according to any one of the above technical solutions, wherein the battery pack provides electrical energy for the power mechanism.

[0023] According to a cover plate assembly, a battery cell, a battery pack and a vehicle of the utility model, the battery end cover assembly is optimized without affecting the battery performance, and a weight reduction groove is arranged on the cover plate. Compared with the prior art, the weight of the cover plate assembly is reduced, and the use of manufacturing raw materials is reduced, which can save battery costs, improve the energy density of the battery, and achieve the purpose of reducing costs and increasing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The following drawings of the embodiments of the present invention are used as part of the present invention for understanding the present invention. The drawings show the embodiments of the present invention and their descriptions, and are used to explain the principles of the present invention. In the drawings,

[0025] Figure 1 A top view of a negative electrode cover according to a preferred embodiment of the present invention;

[0026] Figure 2 A three-dimensional diagram of a negative electrode cover according to a preferred embodiment of the utility model;

[0027] Figure 3 is a cross-sectional view of a negative electrode cover according to a preferred embodiment of the utility model;

[0028] Figure 4 It is a three-dimensional diagram of a negative electrode cover plate assembly according to a preferred embodiment of the utility model;

[0029] Figure 5 is a cross-sectional view of a negative electrode cover plate assembly according to a preferred embodiment of the utility model;

[0030] Figure 6 is a cross-sectional view of a negative electrode cover plate assembly according to a preferred embodiment of the utility model;

[0031] Figure 7 A top view of a lead-out piece according to a preferred embodiment of the utility model;

[0032] Figure 8 A three-dimensional diagram of a lead-out piece according to a preferred embodiment of the utility model;

[0033] Fig. 9 It is a three-dimensional diagram of a negative electrode cover plate assembly according to a preferred embodiment of the utility model;

[0034] Fig.10 is a cross-sectional view of a negative electrode cover plate assembly according to a preferred embodiment of the utility model;

[0035] Fig.11 It is a three-dimensional diagram of a negative electrode top spacer according to a preferred embodiment of the utility model;

[0036] Fig.12 It is a three-dimensional diagram of a negative electrode top spacer according to a preferred embodiment of the utility model;

[0037] Fig.13 It is a three-dimensional diagram of a negative electrode top spacer according to a preferred embodiment of the utility model;

[0038] Fig.14 is a cross-sectional view of a battery cell according to a preferred embodiment of the present utility model;

[0039] Fig.15 A top view of a positive electrode cover plate according to a preferred embodiment of the utility model;

[0040] Fig.16 A three-dimensional diagram of a positive electrode cover plate according to a preferred embodiment of the utility model;

[0041] Fig.17 It is a three-dimensional diagram of a positive electrode cover plate assembly according to a preferred embodiment of the utility model;

[0042] Fig.18 A cross-sectional view of a positive electrode cover plate assembly according to a preferred embodiment of the present utility model;

[0043] Fig.19 It is a cross-sectional view of a positive electrode cover plate assembly according to a preferred embodiment of the utility model.

[0044] Description of reference numerals:

[0045] 100: Negative electrode cover assembly 10: Negative electrode cover

[0046] 11: Boss 12: Pole assembly hole

[0047] 13: Explosion-proof valve exhaust hole 14: Cover plate body

[0048] 15: Weight reduction slot 16: Negative terminal assembly

[0049] 17: Explosion-proof valve 30: Negative lead sheet

[0050] 31: Lead-out piece body 32: Lead-out hole

[0051] 33: Weight reduction groove 34: Reinforcement rib

[0052] 40: negative electrode top spacer 41: spacer body

[0053] 42: Through hole 43: Weight reduction slot

[0054] 44: Reinforcement rib 45: Mounting slot

[0055] 46: Reinforcement rib 200: Positive electrode cover assembly

[0056] 20: Positive electrode cover 21: Boss

[0057] 22: Pole assembly hole 23: Liquid injection hole

[0058] 24: Cover body 25: Weight reduction groove

[0059] 26: Positive terminal assembly 27: Liquid injection valve

[0060] 50: Positive electrode lead-out sheet 60: Positive electrode top spacer

[0061] 70: Core DETAILED DESCRIPTION

[0062] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0063] In order to thoroughly understand the utility model, a detailed description will be provided in the following description. It should be understood that these embodiments are provided to make the disclosure of the utility model thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. Obviously, the implementation of the embodiments of the utility model is not limited to the specific details familiar to those skilled in the art. The preferred embodiments of the utility model are described in detail below, but in addition to these detailed descriptions, the utility model may also have other embodiments.

[0064] Ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers and do not have any other meanings, such as a specific order, etc. Moreover, for example, the term "first component" itself does not imply the existence of the "second component", and the term "second component" itself does not imply the existence of the "first component".

[0065] It should be noted that the terms "upper", "lower", "front", "back", "left", "right", "inside", "outside" and similar expressions used in the present invention are for illustrative purposes only and are not restrictive.

[0066] The utility model discloses a cover plate assembly, a battery monomer, a battery pack and a vehicle.

[0067] Now, exemplary embodiments according to the present invention will be described in more detail with reference to the accompanying drawings.

[0068] The cover plate assembly in this embodiment is divided into a negative electrode cover plate assembly 100 and a positive electrode cover plate assembly 200. The structures of the negative electrode cover plate assembly 100 and the positive electrode cover plate assembly 200 are both similar and different, and are described in detail below.

[0069] like Figure 1 , Figure 2 , Figure 3 As shown, in a preferred embodiment, a negative electrode cover plate assembly 100 includes:

[0070] The negative electrode cover plate 10 has at least one weight-reducing groove 15 at the bottom thereof. The depth of the weight-reducing groove 15 is less than the thickness of the negative electrode cover plate 10 , so as to avoid penetration of the negative electrode cover plate 10 .

[0071] The negative electrode cover plate assembly in this embodiment reduces the weight of the cover plate assembly and the use of raw materials for manufacturing by setting a weight-reducing groove on the negative electrode cover plate compared with the prior art, which can save battery costs, improve the energy density of the battery, and achieve the purpose of reducing costs and increasing efficiency.

[0072] from Figure 2It can be seen that a plurality of weight-reducing grooves 15 are provided at the bottom of the negative electrode cover plate 10, and the corresponding technical effect of such a design is more prominent.

[0073] The weight-reducing groove 15 may be a rectangular groove, a circular groove, an elliptical groove, a triangular groove, an irregularly shaped groove, or other suitable shapes, and the areas of the plurality of weight-reducing grooves 15 may be different.

[0074] The plurality of weight-reducing grooves 15 are not connected to each other, so as to avoid weakening the structural strength of the negative electrode cover plate 10 .

[0075] The weight-reducing groove 15 is formed on the cover body 14 and can be integrally formed when the negative electrode cover 10 is manufactured.

[0076] In one embodiment, the negative electrode cover plate 10 is provided with a boss 11 and a pole assembly hole 12, and the weight-reducing groove 15 is provided to avoid the boss 11 and the pole assembly hole 12. In a cover plate of some structures, the boss 11 does not need to be provided, and in this case, it is not necessary to consider the problem of the weight-reducing groove 15 avoiding the boss 11.

[0077] like Figure 4 , Figure 5 As shown, the boss 11 is made integrally with the negative electrode cover plate 10, protruding toward the top of the negative electrode cover plate 10, and can be used to electrically connect the detection equipment to detect the performance of the battery. The pole assembly hole 12 is used to install the negative terminal assembly 16. The plurality of weight reduction grooves 15 are arranged to avoid the boss 11 and the pole assembly hole 12, and do not affect the functions of the boss 11 and the pole assembly hole 12, nor do they affect the function of the finally assembled negative terminal assembly 16.

[0078] In one embodiment, the negative electrode cover plate 10 is further provided with an explosion-proof valve exhaust hole 13 , and the weight-reducing groove 15 is arranged to avoid the explosion-proof valve exhaust hole 13 .

[0079] like Figure 4 , Figure 5 As shown, the explosion-proof valve exhaust hole 13 is used to install the explosion-proof valve 17. The plurality of weight-reducing grooves 15 are arranged to avoid the explosion-proof valve exhaust hole 13, which does not affect the function of the explosion-proof valve exhaust hole 13, nor does it affect the function of the explosion-proof valve 17 finally assembled.

[0080] In one embodiment, if Figure 6 , Figure 7 , Figure 8 As shown, the negative electrode cover plate assembly 100 further includes:

[0081] The negative electrode lead-out sheet 30 has at least one weight-reducing groove 33 disposed on the top thereof. The depth of the weight-reducing groove 33 is less than the thickness of the negative electrode lead-out sheet 30 , so as to avoid penetration of the negative electrode lead-out sheet 30 .

[0082] from Figure 8It can be seen that a plurality of weight-reducing grooves 33 are provided on the top of the negative electrode lead-out sheet 30, and the corresponding technical effect of such a design is more prominent.

[0083] By providing at least one weight-reducing groove 33 on the negative electrode lead-out plate 30 , the weight of the negative electrode cap plate assembly 100 can be further reduced.

[0084] By providing at least one weight-reducing groove 33 on the negative electrode lead-out sheet 30, the contact area with the top spacer is reduced, thereby preventing the top spacer from being dissolved when the battery tab and the cover plate assembly are welded.

[0085] The negative electrode lead-out sheet 30 is used to be welded to the negative electrode tab of the battery cell and connected to the negative electrode terminal assembly 16 , so that the negative electrode tab of the battery cell is electrically connected to the negative electrode terminal assembly 16 .

[0086] The weight-reducing grooves 33 may be rectangular grooves, circular grooves, elliptical grooves, triangular grooves, irregular pattern grooves, or other suitable shapes, and the areas of the plurality of weight-reducing grooves 33 may be different.

[0087] The plurality of weight-reducing grooves 33 are not connected to each other, so as to avoid weakening the structural strength of the negative electrode lead-out sheet 30 .

[0088] The weight-reducing groove 33 is formed on the lead-out plate body 31 and can be integrally formed when the negative electrode lead-out plate 30 is manufactured.

[0089] In one embodiment, the negative electrode lead-out sheet 30 is provided with a lead-out hole 32 , and the weight-reducing groove 33 is arranged to avoid the lead-out hole 32 . The lead-out hole 32 is used to connect the negative electrode terminal assembly 16 .

[0090] In one embodiment, reinforcing ribs 34 are provided between the weight-reducing grooves 33. The reinforcing ribs 34 can ensure the structural strength of the negative electrode lead-out sheet 30, and the reinforcing ribs 34 can be designed in a cross shape or a well shape.

[0091] In one embodiment, if Fig. 9 , Fig.10 , Fig.11 , Fig.12 , Fig.13 As shown, the negative electrode cover plate assembly 100 further includes:

[0092] The negative electrode top spacer 40 has at least one weight-reducing groove 43 at its bottom, and the depth of the weight-reducing groove 43 is less than the thickness of the negative electrode top spacer 40 to avoid penetrating the negative electrode top spacer 40 .

[0093] By providing at least one weight-reducing groove 43 on the negative electrode top spacer 40 , the weight of the negative electrode cover plate assembly 100 can be further reduced.

[0094] from Fig.11It can be seen that a plurality of weight-reducing grooves 43 are provided at the bottom of the negative electrode top spacer 40, and the corresponding technical effect of such a design is more prominent.

[0095] The negative electrode top spacer 40 cooperates with the negative terminal assembly 16 and the negative electrode cover 10 upward to complete the sealing and insulation of the negative electrode cover 10, and can support and limit the pole core 70 downward, increase the stability of the pole core 70 inside the shell, and prevent the battery from failing during vibration and impact, thereby preventing safety accidents.

[0096] The weight-reducing groove 43 may be a rectangular groove, a circular groove, an elliptical groove, a triangular groove, an irregularly shaped groove, or other suitable shapes, and the areas of the plurality of weight-reducing grooves 43 may be different.

[0097] The plurality of weight-reducing grooves 43 are not connected to each other, so as to avoid weakening the structural strength of the negative electrode top spacer 40 .

[0098] The weight-reducing groove 43 is formed on the spacer body 41 and can be integrally formed when the negative electrode top spacer 40 is manufactured.

[0099] In one embodiment, if Fig.11 , Fig.12 , Fig.13 As shown, the negative electrode top spacer 40 is provided with a through hole 42 and a mounting groove 45 , and the weight-reducing groove 43 is arranged to avoid the through hole 42 and the mounting groove 45 .

[0100] The through hole 42 is used for the negative terminal assembly 16 to pass through.

[0101] In one embodiment, reinforcing ribs 44 are provided between the weight-reducing grooves 43;

[0102] The mounting groove 45 is used to mount the negative electrode lead-out plate 30 , and a reinforcing rib 46 is disposed in the mounting groove 45 .

[0103] The reinforcing ribs 44 and 46 can ensure the structural strength of the negative electrode top spacer 40 .

[0104] The reinforcing rib 44 can be designed to be a cross or a well shape, and the reinforcing rib 46 can be a suitable shape such as a rectangle, a circle, an ellipse, a triangle, an irregular shape, etc.

[0105] like Fig.15 , Fig.16 , Fig.17 As shown, in a preferred embodiment, a positive electrode cover plate assembly 200 includes:

[0106] The positive electrode cover plate 20 has at least one weight-reducing groove 25 at the bottom thereof. The depth of the weight-reducing groove 25 is less than the thickness of the positive electrode cover plate 20 , so as to avoid penetration of the positive electrode cover plate 20 .

[0107] The positive electrode cover plate assembly in this embodiment reduces the weight of the cover plate assembly and the use of raw materials for manufacturing by setting a weight-reducing groove on the positive electrode cover plate compared with the prior art, which can save battery costs, improve the energy density of the battery, and achieve the purpose of reducing costs and increasing efficiency.

[0108] from Fig.16 It can be seen that a plurality of weight-reducing grooves 25 are provided at the bottom of the positive electrode cover plate 20, and the corresponding technical effect of such a design is more prominent.

[0109] The weight-reducing groove 25 may be a rectangular groove, a circular groove, an elliptical groove, a triangular groove, an irregularly shaped groove, or other suitable shapes, and the areas of the plurality of weight-reducing grooves 25 may be different.

[0110] The plurality of weight-reducing grooves 25 are not connected to each other, so as to avoid weakening the structural strength of the positive electrode cover plate 20 .

[0111] The weight-reducing groove 25 is formed on the cover plate body 24 and can be integrally formed when the positive electrode cover plate 20 is manufactured.

[0112] In one embodiment, the positive electrode cover plate 20 is provided with a boss 21 and a pole assembly hole 22, and the weight-reducing groove 25 is provided to avoid the boss 21 and the pole assembly hole 22. On a cover plate of some structures, the boss 21 does not need to be provided, and in this case, there is no need to consider the problem of the weight-reducing groove 25 avoiding the boss 21.

[0113] like Fig.18 , Fig.19 As shown, the boss 21 is made integrally with the positive electrode cover plate 20, protruding toward the top of the positive electrode cover plate 20, and can be used to electrically connect the detection equipment to detect the performance of the battery. The pole assembly hole 22 is used to install the positive terminal assembly 26. The plurality of weight reduction grooves 25 are arranged to avoid the boss 21 and the pole assembly hole 22, and do not affect the functions of the boss 21 and the pole assembly hole 22, nor do they affect the function of the finally assembled positive terminal assembly 26.

[0114] In one embodiment, the positive electrode cover plate 20 is further provided with a liquid injection hole 23 , and the weight reduction groove 25 is arranged to avoid the liquid injection hole 23 .

[0115] like Fig.18 , Fig.19 As shown, the injection hole 23 is used to install the injection valve 27. The plurality of weight-reducing grooves 25 are arranged to avoid the injection hole 23, which does not affect the function of the injection hole 23, and also does not affect the function of the injection valve 27 that is finally assembled.

[0116] In one embodiment, the positive electrode cap assembly 200 further includes:

[0117] The structure of the positive electrode lead-out sheet 50 may refer to the negative electrode lead-out sheet 30 , and will not be described in detail here.

[0118] In one embodiment, the positive electrode cap assembly 200 further includes:

[0119] The structure of the positive electrode top spacer 60 can refer to the negative electrode top spacer 40 and will not be described in detail here.

[0120] like Fig.13 As shown, an embodiment of the utility model further provides a battery cell, comprising:

[0121] A shell, wherein the top of the shell is provided with an opening;

[0122] The cover plate assembly according to any one of the above embodiments, wherein the cover plate assembly is disposed at the opening of the housing, and the cover plate assembly is sealed and connected to the housing; and

[0123] The pole core is arranged inside the shell, and the top spacer is pressed against the top of the pole core to limit the pole core.

[0124] An embodiment of the utility model further provides a battery pack, comprising the battery cells described in any one of the above embodiments, wherein a plurality of battery cells can be connected in series or in parallel in the battery pack to meet the design requirements of parameters such as voltage and current of the battery pack.

[0125] An embodiment of the utility model further provides a vehicle, comprising a power mechanism and a battery pack according to any one of the above embodiments, wherein the battery pack provides electrical energy for the power mechanism.

[0126] The power mechanism includes an electric motor and a reducer. The battery cells can form a battery module. The battery pack is installed on the vehicle to provide electrical energy for the electric motor.

[0127] The shape of the battery cell in this embodiment is rectangular, but may also be cylindrical, square or other shapes.

[0128] According to a cover plate assembly, a battery cell, a battery pack and a vehicle of the utility model, the battery end cover assembly is optimized without affecting the battery performance, and weight reducing grooves are arranged on the cover plate, the lead-out plate and the top spacer. Compared with the prior art, the weight of the cover plate assembly is reduced, and the use of manufacturing raw materials is reduced, which can save battery costs, improve the energy density of the battery, and achieve the purpose of reducing costs and increasing efficiency.

[0129] The processes and steps described in all the above preferred embodiments are only examples. Unless adverse effects occur, various processing operations can be performed in a sequence different from the sequence of the above processes. The sequence of steps in the above processes can also be increased, merged or deleted according to actual needs.

[0130] In understanding the scope of the present invention, the term "comprising" and its derivatives as used herein are intended to be open terms, which specify the existence of the recorded features, elements, components, groups, wholes and / or steps, but do not exclude the existence of other unrecorded features, elements, components, groups, wholes and / or steps. This concept also applies to words with similar meanings, such as the terms "including", "having" and their derivatives.

[0131] The terms "attached" or "attached" as used herein include: a configuration where an element is directly secured to another element by directly securing the element to the other element; a configuration where an element is indirectly secured to another element by securing the element to an intermediate member which in turn is secured to the other element; and a configuration where one element is integral with the other element, i.e., one element is substantially a part of the other element. This definition also applies to words with similar meanings such as "connect," "connect," "couple," "mount," "bond," "fix," and their derivatives. Finally, terms of degree such as "substantially," "approximately," and "approximately" as used herein represent the amount of deviation that modifies the term such that the end result will not be significantly changed.

[0132] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. The features described herein in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable or otherwise specified in the other embodiment.

[0133] The utility model has been described through the above-mentioned embodiments, but it should be understood that the above-mentioned embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the utility model is not limited to the above-mentioned embodiments, and more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of protection claimed by the utility model.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate, wherein at least one first weight-reducing groove is provided at the bottom of the cover plate, and the depth of the first weight-reducing groove is less than the thickness of the cover plate; A lead-out piece, wherein at least one second weight-reducing groove is arranged on the top of the lead-out piece, and the depth of the second weight-reducing groove is less than the thickness of the lead-out piece.

2. The cover plate assembly according to claim 1, characterized in that: The cover plate is provided with a boss and / or a pole assembly hole, and the first weight-reducing groove is arranged to avoid the boss and the pole assembly hole.

3. The cover plate assembly according to claim 2, characterized in that: The cover plate is also provided with an explosion-proof valve exhaust hole or a liquid injection hole, and the first weight reduction groove is arranged to avoid the explosion-proof valve exhaust hole or the liquid injection hole.

4. The cover plate assembly according to claim 1, characterized in that: The lead-out piece is provided with a lead-out hole, and the lead-out hole is used to connect the terminal assembly, and the second weight-reducing groove is arranged to avoid the lead-out hole.

5. The cover plate assembly according to claim 1, characterized in that: A first reinforcing rib is arranged between the second weight-reducing grooves.

6. The cover plate assembly according to claim 1, characterized in that: Also includes: A top spacer ring, wherein at least one third weight-reducing groove is arranged at the bottom of the top spacer ring, and the depth of the third weight-reducing groove is less than the thickness of the top spacer ring.

7. The cover plate assembly according to claim 6, characterized in that: The top spacer is provided with a through hole and a mounting groove, and the third weight-reducing groove is arranged to avoid the through hole and the mounting groove.

8. The cover plate assembly according to claim 7, characterized in that: A second reinforcing rib is provided between the third weight-reducing grooves; The installation groove is used for installing the lead-out piece, and a third reinforcing rib is arranged in the installation groove.

9. A battery cell, characterized in that: include: A housing, wherein the top of the housing is provided with an opening; According to the cover plate assembly according to any one of claims 1 to 8, the cover plate assembly is arranged at the opening of the shell, and the cover plate assembly is sealed and connected to the shell.

10. A battery pack, characterized in that: The invention comprises the battery cell according to claim 9.

11. A vehicle, comprising a power mechanism, characterized in that: It also includes a battery pack according to claim 10, wherein the battery pack provides electrical energy for the power mechanism.

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